United States Citizenship and Immigration Services
Overview
 
United States Citizenship and Immigration Services (USCIS) is a component of the United States
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 Department of Homeland Security (DHS). It performs many administrative functions formerly carried out by the legacy United States Immigration and Naturalization Service (INS), which was part of the Department of Justice
United States Department of Justice
The United States Department of Justice , is the United States federal executive department responsible for the enforcement of the law and administration of justice, equivalent to the justice or interior ministries of other countries.The Department is led by the Attorney General, who is nominated...

. The stated priorities of the USCIS are to promote national security, to eliminate immigration
Immigration
Immigration is the act of foreigners passing or coming into a country for the purpose of permanent residence...

 case backlogs, and to improve customer services.
 
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